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HEATING FURNACE.

(Application filed June 2, 1898.)

2 Sheets-Sheet l.

U40 Model.)

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No. 626,465. Patented June 6, I899. A. JOHNSON.

HEATING FURNACE.

(Application filad June 2, 1898.) (No Model.) 2 Sheets-Sheet 2.

F a 1'! w 1490003 UNrrt: STATES PATENT FFICE.

AUGUST JOHNSON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR, BY DIRECT AND HESNE ASSIGNMENTS, TO THE OIL-FUEL SAVING COMPANY, OF

SAME PLA CE.

HEATING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 626,465, dated June 6, 1899.

Application filed June 2, 1898. erial No- 682,327.

To all 1071 0721, it ml/t7 concern:

Be it known that I, AUGUST JOHNSON, a citizen of the United States, residing in the city and county of San Francisco, State of q California,haveinvented an Improvementin IIeating-Furnaces and I hereby declare the following to be a full, clear, and exact de- .scription of the same.

My invention relates to an improvement in i0 heating-furnaces.

It is especially designed to be used in conjunction with furnaces where heat is required either for making steam, as in boiler-furnaces, for roasting or smelting ores, or it may be used in any relation where heat and perfect combustion are required.

It consists of the parts and the constructions and combinations of parts hereinafter described and claimed.

Figure l is a longitudinal vertical section on line Z Z, Fig. 2, showing the application of my invention to a boiler-furnace. Fig. 2 is a longitudinal horizontal section on line Y Y, Fig. 1, also showing the passages H in section. Fig. 3 is a vertical transverse section on line X X, Fig. 1.

The object of my invention is to provide a means for heating air which is to be used for combustion to a higher temperature and then 0 introducing it, in conjunction with a liquid fuel, into a combustion-chamber of peculiar form,wherein an intimate mixture takes place and a very perfect combustion. The furnace thus constructed may be employed wherever a high degree of heat and perfect combustion are required. I have here shown it in conj unction with a steam-boiler A of any suitable or desired description. In the present case I have shown a fire-box or combustion-chamber 4o 13 beneath the boiler, through which the products of combustion pass to the rear combustion-chamber O, thence returning through fines to the smoke-stack E at the front of the boiler; but the apparatus is equally well fitted to be used in conjunction with otherforms of boilers or with other forms of heating apparatus.

F is an air-pipe which I have here shown extending into the lower part of the chamber B from the rear of the boiler-setting, and this passage has at the outer end a branch pipe (No model.)

F, through which a blast may be furnished when desired from any suitable air-forcing mechanism.

At F isan opening with acontrolling-valve which may be opened to admit air for natural draft when the force-draft is out of use, so that either may be used at will. The air passing in or through the passage F enters a broad flattened chamber G beneath the firebox, into which the pipe passes with a downward curvature, as shown, so as to deliver the air into this chamber near the front and lower portion. From this point the air distributes through the chamber, rising toward the rear, where it enters the pipes or passages II at each side of the chamber and within the walls of the fire-box, so as to be exposed to a high temperature therein. \Vithin these walls the pipes l-I follow a sinuous or serpen- 7c tine course, as shown, and finally terminate in a transverse passage 11, with the opposite ends of which these pipes II connect, and this passage inclines from these exterior pipes to- Ward the center, as shown. ,At this point it connects with a discharge-pipe I, through which the blast is directed into the furnace.

J are pipes or passages leading downwardly at an incline, as here shown, and opening into the transverse air-passage H at a point upon each side of the discharge-tube I, which is situated below the pipe 11. These pipes J J serve to convey a liquid fuel, which is preferably some form of petroleum product, such as crude petroleum, and this is brought through a suitable conducting-pipe having a controlling cook or valve K, so that the supply through the pipes J may be regulated at will. The oil thus delivered encounters the highly-heatedair in the pipe H and its temo perature is at once raised, so that the oil may be vaporized and passed out through the pipe I. The blast of air is sufficient to carry the oil along with it through the pipe I, from the mouth of which it discharges into the combustion-chamber B. This combustion-chamber is a peculiarly-curved chamber, the base or bottom of which inclines upwardly and rearwardly from the mouth of the dischargepipe I and returns upon itself in a curvature [0O resembling that of a parabola. The jet of air and oil delivered into this chamber are in When the apparatus is in full working order, an intense heat is produced in the combustion-chamber B, the result of which, in conjunction with the supply of highly-heated air and oil, is to produce athorough and perfect combustion with little or no smoke, the heat being particularly well adapted for use in boiler-furnaces as well as for other purposes where a perfect combustion and little deposit of carbon or other foreign substances are desired.

The furnaceis provided with doors L, which remain closed while the furnace is in operation, but which may be opened when it is desired to first commence operations, so that a small quantity of any ordinary fuel can be introduced either upon a temporary or permanent grate or directly upon the masonry setting above the tube I, so that the parts may be heated, or, if desired, steam can be raised in the boiler su'fficient to operate the air-forcing mechanism to provide for a forcedraft. If the force-draft is not required, the heat will be sufficient to heat the air and the oil, so that operations can be commenced with a natural draft, after which no further fire of this description will be needed.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. A heating-furnace comprising a main combustion-chamber, a communicating primary combustion-chamber below the front portion thereof, a discharge-pipe, an oil-supply, air-supply pipes, and a transverse pipe connecting at its opposite portions with the air-pipes and at intermediate points with the discharge-pipe and oil-supply.

2. In a heating-furnace, a main combustion-chamber, a primary combustion-chamber situated below the front portion of the main chamber, having acurved rear end with the upper portion diverging upwardly so as to discharge into the main chamber, a discharge pipe or passage opening in line with the lower part of the primary chamber, airheating pipes situated in the walls of the fur-- nace, a transverse pipe connecting at its opposite ends with the air-pipes and having its intermediate portion connecting with the discharge-pipe, and oil-supply pipes discharging into said transverse pipe so that oil and air are mixed and delivered together into the discharge-pipe. i

3. In a heating-furnace, a main combustion-chamber, a primary chamber situated below and connecting with the rear portion of the main chamber, a curved chamber formed beneath the floor of the primary combustion-chamber and having a corresponding curvature, and air-pipes leading from the rear portion of the furnace beneath the floor of the main combustion-chamber following- AUGUST JOHNSON.

Witnesses:

S. II. NOURSE, H. F. AsoHEoK. 

